预应力管道灌浆密实度探地雷达模型试验及正演模拟

预应力桥梁管道的灌浆质量直接影响桥梁的使用年限,为了将探地雷达探测应用到预应力管道灌浆质量检测的实际工程中,首先制作含有不同工况的预应力管道物理模型,用探地雷达对模型进行探测。对所探测得到的数据进行处理分析,并分别对不同工况的预应力管道进行正演模拟分析。结果表明:探地雷达对塑料管道内部探测效果好于金属管道,但两者对电磁波的反射信号剖面图上均显示为弧形。二维雷达剖面图像能准确反映出管道的位置和塑料管道灌浆质量,三维图更加立体直观。将正演模拟结果和物理模型探地雷达探测结果进行对比分析,表明了模拟结果的正确性,充分验证了探地雷达对预应力管道灌浆质量探测的可行性,对桥梁的质量检测提供理论依据。

Model test and forward simulation of grouting compactness of prestressed pipeline ground penetrating radar

The grouting quality of prestressed bridge pipeline directly affects the service life of bridge.In order to apply ground penetrating radar(GPR)detection to the actual project of prestressed pipeline grouting quality detection,the physical model of prestressed pipeline with different working conditions is made,and the model is detected by ground penetrating radar(GPR).The detected data are processed and analyzed,and the forward simulation analysis of prestressed pipes under different working conditions is carried out.The results show that the detection effect of GPR on the interior of plastic pipe is better than that of metal pipe,but both of them show arc on the reflected signal profile of electromagnetic wave.The two-dimensional radar profile image can accurately reflect the position of the pipeline.